坑侧土体卸荷的侧向应力-应变关系研究  

RESEARCH ON LATERAL STRESS-STRAIN RELATION ON SIDE OF FOUNDATION PIT WITH LATERAL UNLOADING

作　　者：梅国雄[1] 陈浩[1] 卢廷浩[2] 殷宗泽[2] 

机构地区：[1]南京工业大学土木工程学院,江苏南京210009 [2]河海大学岩土工程研究所,江苏南京210098

出　　处：《岩石力学与工程学报》2010年第A01期3108-3112,共5页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(50608038);江苏省自然科学基金项目(BK2007582);高等学校博士学科点专项科研基金项目(20070294002)

摘　　要：利用平面应变仪对坑侧土体进行k0固结-侧向卸荷的试验研究,指出经过侧向卸荷过程的土样抗剪强度指标与常规三轴压缩试验结果明显不同;得出侧向卸荷土体的侧向应力-应变间也呈双曲线关系,据此运用邓肯-张建模思路,推导出反映坑侧土体侧向卸荷实际应力路径下的侧向应力-应变关系模型,模型预测与试验结果吻合较好。Taking soil on the side of foundation pit excavation with ko consolidation-lateral unloading plane strain experiment on plane strain apparatus, the testing results indicate that the shear strength indices of soil are obviously different between the lateral unloading and routine triaxial tests. Experimental analyses show that curves of lateral stress-strain under lateral unloading are also similar to a hyperbolic type. The lateral stress-strain relation of actual stress path and lateral unloading soil on the side foundation pit is deduced using Duncan-Chang model. Results between experimental data and model predicated are coincided very well.

关 键 词：土力学 基坑开挖 平面应变试验 侧向卸荷 侧向应力-应变关系 

分 类 号：TU43[建筑科学—岩土工程]